New 79cc build

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birdmannn101

birdmannn101

New Member
Oct 23, 2011
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Indianapolis, IN
headtrama said:
I have been riding this bike off and on now for a while. Here are my thoughts of the 79cc motor, it's a dog off the line but once it gets going it's not bad. The motor runs smooth with no vibration, I could probably do a few more things to this motor to make it work better but I'm replacing it with a 99cc.
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Andy, Great race videos. Hey, maybe I am missing something but I can't see any of your pictures at Photobucket. I really want to see that kick start. The main question I have since I have a 79cc build is how did you get rid of that initial roll vibration and clutch chatter? I replaced the spring in the clutch to start pulling at 3100 RPM but the clutch chatter/vibration is still there...Dan
 
headtrama

headtrama

Member
Jul 8, 2010
886
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california
Yeah I'm not using a shoe clutch, I am running a cheetah clutch and get no chatter at all. Are you talking about the picture where I said I'll just put a loop in the rope and make a kick start. If so I was just messing around. It's still a pull start.
 
birdmannn101

birdmannn101

New Member
Oct 23, 2011
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Indianapolis, IN
The only problems I have are with what I found on the Internet. It says 3/4" bore drive with 3/16" keyway and my HF79cc is 5/8" drive.

Factory Set to engage at 4000 RPM. The HF79cc engine Maximum speed (rpm) is 3600 RPM with a Maximum Torque (ft. - lbs.) 3.5 ft. lbs. @ 2500 RPM, so I'm thinking this might not work in my case.

This racing clutch looks like what I need if it fit the engine.
 
birdmannn101

birdmannn101

New Member
Oct 23, 2011
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Indianapolis, IN
Already disconnected the govenor. Can you get the 5/8th " sleeve from where you buy the clutch? Where do you guys get a decent price on that clutch?

If anyone is interested I built a charging box out of Radio Shack stuff for around $20 to $25 which will convert a Sturmey Archer dynamo AC to DC and charge 4 AA re-chargeable batteries for a 6 volt lighting system. It puts out .2 to .5 DC when I turn the wheel. Too cold to set up a multi-meter and see what the charge puts out at 40 MPH.

Dan
 
birdmannn101

birdmannn101

New Member
Oct 23, 2011
163
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Indianapolis, IN
headtrama said:
You need to remove the Governor.
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Buying the Noram Cheetah Clutch should get rid of the clutch chatter vibration, right Mike and Headtrauma?

I guess I asked the wrong question about the Cheetah engaging at 4000 RPM when I quoted the HF79cc engine statistic being Factory Set to engage at 4000 RPM. The HF79cc engine Maximum speed (rpm) is 3600 RPM with a Maximum Torque (ft. - lbs.) 3.5 ft. lbs. @ 2500 RPM. After I disconnected the govenor it opened the engine up to a higher RPM. So ... Headtraums, do you still think that I need to physically remove the govenor from the engine?



Dan
 
silverbear

silverbear

The Boy Who Never Grew Up
Jul 9, 2009
8,325
670
113
northeastern Minnesota
headtrama said:
You need to remove the Governor from the inside.
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Are you sure about this? My understanding was that the bigger 212 predator needed to be removed from the inside, but I recall a number of us simply disconnecting the governor from the outside on the smaller 79cc greyhound and 99cc predator engines. That's all I did on a 79cc I used for several years before selling it and have been using a 99 predator for a couple of years now with the governor simply disconnected. No problems at all and I don't recall hearing about someone blowing an engine or whatever by simply disconnecting the governor from the outside. Could you clarify this?
SB
 
runnermike

runnermike

Member
Nov 18, 2012
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Sanford, FL
SB......I'm curious about this as well. Hopefully someone will chime in. But, when I pick up my new one Friday I think I'm still going to remove it from the inside.
 
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